How to use java libraries with scala using sbt?

Question

So, I have a project written in Scala for Spark. The current sbt file looks like this.

name := "MyProgram"

version := "1.0"

scalaVersion := "2.10.4"

libraryDependencies += "org.apache.spark" %% "spark-core" % "1.1.0"

Say, I want to use external java libraries, and all those libraries are in a directory lib. How should I modify the sbt file to include those libraries?

If those external libraries are available on Maven or other publicly accessible repos you should add them as dependencies to your build.sbt. — Soumya Simanta
– Soumya Simanta, Commented May 31, 2015 at 13:07

Dominic Bou-Samra · Accepted Answer · 2015-05-31 08:50:08Z

5

Sbt should auto include all jars inside the lib folder.

Dependencies that are just floating around in the lib folder (rather than declared in your build.sbt file) are called unmanaged dependencies

edited May 31, 2015 at 8:50

answered May 31, 2015 at 8:46

Dominic Bou-Samra

15.5k28 gold badges108 silver badges165 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

MetallicPriest Over a year ago

My current source code files are in folder src\main\scala. Where should I put the lib folder?

Dominic Bou-Samra Over a year ago

The lib folder belongs at the top level of your project. Alongside src

MetallicPriest Over a year ago

Great. And If I want to run the program on an another computer (not where I compiled), where should I place those lib files?

Dominic Bou-Samra Over a year ago

Same folder. The link I posted outlines how unmanaged dependencies work

marios Over a year ago

Dominic answer is correct. However, that works as long as you are running everything from the same machine you are compiling. If you want to run on different machine then you need to package your project. You can try using a uber/fat jar plugin, like sbt-assembly. Otherwise, you can use the package task and then make sure all dependencies (managed and unmanaged) are included in the Java classpath.

|

elm · Accepted Answer · 2015-06-02 12:06:18Z

0

As a use case example of unmanaged dependencies (as mentioned by Dominic) add these patterns in build.sbt,

unmanagedBase <<= baseDirectory(_ / "./java-libs")

unmanagedClasspath in Compile +=
    file(System.getenv("EXTRA_LIBS_HOME")) / "java-libs/package.jar"

answered Jun 2, 2015 at 12:06

elm

20.5k15 gold badges72 silver badges116 bronze badges

Collectives™ on Stack Overflow

How to use java libraries with scala using sbt?

2 Answers 2

6 Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

6 Comments

Comments

Related